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arXiv 1007.3145hep-ph
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高能对撞机上的横向λ偏振

Transverse Lambda polarization at high energy colliders

Daniel Boer

摘要:

高能pp碰撞中产生的λ超子的横向极化的测量可能有助于解决关于λ产生和极化机制的几个公开问题,例如SU(3)破缺的数量,胶子和海夸克的重要性,以及自发λ极化的起源。在中快度下的p + p -> Lambda^ \uparrow + jet + X过程非常适合于这个目的,例如在LHC的ALICE实验中。新的表达式和预测的横向λ偏振在这个过程中,在一个分解的描述,其中涉及横向动量和自旋的依赖性在碎裂过程中。由于SU(3)破缺的大小未知以及pp和e^+ e^-数据之间明显的不一致性,我们研究了非极化λ碎裂函数的不一致性。

英文摘要:

Measurements of transverse polarization of Lambda hyperons produced in high energy pp collisions may help to address several open issues about Lambda production and polarization mechanisms, such as the amount of SU(3) breaking, the importance of gluons and sea quarks, and the origin of spontaneous Lambda polarization. The process p + p -> Lambda^\uparrow + jet + X at midrapidity is ideally suited for this purpose, for instance at LHC's ALICE experiment. New expressions and predictions are presented for the transverse Lambda polarization in this process, within a factorized description which involves transverse momentum and spin dependence in the fragmentation process. Uncertainties from the unpolarized Lambda fragmentation functions, due to the unknown magnitude of SU(3) breaking and the apparent inconsistency between pp and e^+ e^- data, are investigated.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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